Here, we solving differential equation (7) by considering expansion \(V(r)\)  up to the 10th order for calculating binding energy \(E_{B}\)  of pentaquark. Hence, an approximation was attempted up to the 10th order, not only expanded potential behavior up to the 10th order is the same as potential behavior in equation (1), but also resulting of binding energy have sufficient precision compared to numerical literature[1]}, [2]}. This is indicating adequacy of approximation.
